<template>
  <div class="list" ref="wrapper">
    <div>
        <div class="area">
            <div class="title border-topbottom">当前城市</div>
            <div class="button-list">
                <div class="button-wrapper">
                    <div class="button">{{this.city}}</div>
                </div>
            </div>
        </div>
        <div class="area">
            <div class="title border-topbottom">热门城市</div>
            <div class="button-list">
                <div class="button-wrapper" v-for="item of hotCities" :key="item.id" @click="handleCityClick(item.name)">
                    <div class="button">{{item.name}}</div>
                </div>
            </div>
        </div>
        <div class="area" v-for="(item, key) of cities" :key="key" :ref="key">
            <div class="title border-topbottom">{{key}}</div>
            <div class="item-list">
                <div class="item  border-topbottom" v-for="innerItem of item" :key="innerItem.id"  @click="handleCityClick(innerItem.name)">
                    {{innerItem.name}}
                </div>
            </div>
        </div>
    </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'
export default {
  name: 'CityList',
  props: {
    cities: Object,
    hotCities: Array,
    letter: String
  },
  computed: {
    ...mapState(['city'])
  },
  methods: {
    handleCityClick (city) {
      //   this.$store.commit('changeCity', city)
      this.changeCity(city)
      //   this.$store.dispatch('changeCity', city)
      this.$router.push('/')
    },
    ...mapMutations(['changeCity'])
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper)
  },
  watch: {
    letter () {
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        // 上下滚动传递的必须是dom 结构，this.$refs[this.letter] 是数组
        this.scroll.scrollToElement(element)
      }
    }
  }
}
</script>

<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
  .border-topbottom
    &:before
        border-color: #ccc
    &:after
        border-color: #ccc
  .list
    overflow: hidden
    position: absolute
    top: 1.58rem
    left: 0
    right: 0
    bottom: 0
    .title
        line-height: .54rem
        background: #eee
        padding-left: .2rem
        color: #666
        font-size: .26rem
    .button-list
        overflow: hidden
        padding: .1rem .6rem .1rem .1rem
        .button-wrapper
            float: left
            width: 33.33%
            .button
                margin: .1rem
                padding: .1rem
                text-align: center
                border: .02rem solid #ccc
    .item-list
        .item
            line-height: .76rem
            padding-left: .2rem

</style>
